Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1996-12-10
1999-08-31
Chen, Vivian
Stock material or miscellaneous articles
Composite
Of polycarbonate
428421, 428422, 4284744, 4284763, 4284769, 428480, 428483, 428515, 428516, 428520, 428522, 428523, 428910, 26417313, 26417314, 26417315, 26417316, B32B 2708, B32B 2732, B32B 2734, B32B 2736
Patent
active
059452218
ABSTRACT:
The present invention provides biaxially oriented multilayer fluoropolymer films. They are produced by coextruding or laminating films having at least one layer of a fluoropolymer, at least one layer of a thermoplastic homopolymer or copolymer and an intermediate adhesive layer which is preferably a polyolefin having at least one functional moiety of an unsaturated carboxylic acid or anhydride thereof. With this structure the thermoplastic layer allows the fluoropolymer layer to be biaxially stretched many times its original length. A high orientation ratio for the fluoropolymer film increases the mechanical strength, toughness, and water vapor barrier properties of the film while using a thinner gauge fluoropolymer film. Coextrusion processing can be done at higher temperatures, i.e. in the range of from at about 280.degree. C. to about 400.degree. C. These temperatures allow films to be produced in the absence of polymer degradation and film melt fracture.
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Degrassi Alfieri
Khanna Yash Paul
Mackey Joseph Edgar
Schneider Russell Lee
Tsai Mingliang Lawrence
Allied-Signal Inc.
Chen Vivian
Criss Roger H.
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